Time is not a constant, as, time does not exist. Time is only relative to one's perception of it.
Time is not a Physical property.
Time cannot be slowed, sped up, reversed, bent, folded, stapled or mutilated, Even though I have done that on occasion,
Time is only the Duration of One Moment to the next as observed by a Sentient Being in a relative environment,
Time only exists, in a true form, when an intelligent being applies a relative measurement to the duration of a given moment.
The formula for time is,
Time = [Re + Rp] + [D x Rm]
[ Relative environment, + Relative perspective ] + [ Duration of a given moment multiplied by a Relative measurement ] = Time.
Time is only your Relative Perception of one moment to the next in your Relative Environment and has no bearing on any Physical Event, other than, the relative duration of the event moment.
If it appears too overlap, then that is only a 'glitch' in one's relative perception.
Added: to the TD; prove me wrong.
Added: I noticed that the category of this thread is Physics; however, I am answering out of the Philosophy section....curious!
Let me expand on Relative Perception. You notice that I use the term 'relative' in most of my references. this is because everything is subjective to relativity. Einstein used this reference in all his works; ie: Theory of Relativity. Key word "Relativity'
Your perception of time is relative to the 'thought activity' in your relative environment.
Your thought process can loose the perception of time; and, can perceive it as going to fast, or dragging on forever, ie: The longest time of the day, for an average office worker starts at 5 minutes to 5:00.
also, playing on Y Q/A, for what you think is about an hour, then looking up at the clock and seeing 3 AM.
Or, when you are in a hurry too be someplace, and you are actually watching the clock speed up, as you hit every red light. and those red lights seem longer than they should be.
You know that clock is going the same speed, but, your perception says otherwise.
Like you just started class last week, and mid-terms are tomorrow.